1 files changed, 2 insertions, 23 deletions
diff --git a/spec/ruby/core/kernel/yield_self_spec.rb b/spec/ruby/core/kernel/yield_self_spec.rb
index 0bcf0660c2..affedae144 100644
--- a/spec/ruby/core/kernel/yield_self_spec.rb
+++ b/spec/ruby/core/kernel/yield_self_spec.rb
@@ -1,29 +1,8 @@
 require_relative '../../spec_helper'
+require_relative 'shared/then'
 
 ruby_version_is "2.5" do
   describe "Kernel#yield_self" do
-    it "yields self" do
-      object = Object.new
-      object.yield_self { |o| o.should equal object }
-    end
-
-    it "returns the block return value" do
-      object = Object.new
-      object.yield_self { 42 }.should equal 42
-    end
-
-    it "returns a sized Enumerator when no block given" do
-      object = Object.new
-      enum = object.yield_self
-      enum.should be_an_instance_of Enumerator
-      enum.size.should equal 1
-      enum.peek.should equal object
-      enum.first.should equal object
-    end
-
-    it "has an alias `then`" do
-      object = Object.new
-      object.then { 42 }.should equal 42
-    end
+    it_behaves_like :kernel_then, :yield_self
   end
 end